Signal for an ambulatory aid



FIG. 1 is a front elevational view with a signal for an ambulatory aid shown in phantom;

FIG. 2 is a left end elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right end elevational view;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a signal of an ambulatory aid, as shown and described. 